1: News about PCRE releases
2: ------------------------
3:
4: Release 8.34 15-December-2013
5: -----------------------------
6:
7: As well as fixing the inevitable bugs, performance has been improved by
8: refactoring and extending the amount of "auto-possessification" that PCRE does.
9: Other notable changes:
10:
11: . Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
12: an empty string. If it can, pcretest shows this in its information output.
13:
14: . A back reference to a named subpattern when there is more than one of the
15: same name now checks them in the order in which they appear in the pattern.
16: The first one that is set is used for the reference. Previously only the
17: first one was inspected. This change makes PCRE more compatible with Perl.
18:
19: . Unicode character properties were updated from Unicode 6.3.0.
20:
21: . The character VT has been added to the set of characters that match \s and
22: are generally treated as white space, following this same change in Perl
23: 5.18. There is now no difference between "Perl space" and "POSIX space".
24:
25: . Perl has changed its handling of \8 and \9. If there is no previously
26: encountered capturing group of those numbers, they are treated as the
27: literal characters 8 and 9 instead of a binary zero followed by the
28: literals. PCRE now does the same.
29:
30: . Following Perl, added \o{} to specify codepoints in octal, making it
31: possible to specify values greater than 0777 and also making them
32: unambiguous.
33:
34: . In UCP mode, \s was not matching two of the characters that Perl matches,
35: namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
36: were matched by \h.
37:
38: . Add JIT support for the 64 bit TileGX architecture.
39:
40: . Upgraded the handling of the POSIX classes [:graph:], [:print:], and
41: [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
42: does in Unicode mode.
43:
44: . Perl no longer allows group names to start with digits, so I have made this
45: change also in PCRE.
46:
47: . Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
48: mean "start of word" and "end of word", respectively, as a transition aid.
49:
50:
51: Release 8.33 28-May-2013
52: --------------------------
53:
54: A number of bugs are fixed, and some performance improvements have been made.
55: There are also some new features, of which these are the most important:
56:
57: . The behaviour of the backtracking verbs has been rationalized and
58: documented in more detail.
59:
60: . JIT now supports callouts and all of the backtracking verbs.
61:
62: . Unicode validation has been updated in the light of Unicode Corrigendum #9,
63: which points out that "non characters" are not "characters that may not
64: appear in Unicode strings" but rather "characters that are reserved for
65: internal use and have only local meaning".
66:
67: . (*LIMIT_MATCH=d) and (*LIMIT_RECURSION=d) have been added so that the
68: creator of a pattern can specify lower (but not higher) limits for the
69: matching process.
70:
71: . The PCRE_NEVER_UTF option is available to prevent pattern-writers from using
72: the (*UTF) feature, as this could be a security issue.
73:
74:
75: Release 8.32 30-November-2012
76: -----------------------------
77:
78: This release fixes a number of bugs, but also has some new features. These are
79: the highlights:
80:
81: . There is now support for 32-bit character strings and UTF-32. Like the
82: 16-bit support, this is done by compiling a separate 32-bit library.
83:
84: . \X now matches a Unicode extended grapheme cluster.
85:
86: . Case-independent matching of Unicode characters that have more than one
87: "other case" now makes all three (or more) characters equivalent. This
88: applies, for example, to Greek Sigma, which has two lowercase versions.
89:
90: . Unicode character properties are updated to Unicode 6.2.0.
91:
92: . The EBCDIC support, which had decayed, has had a spring clean.
93:
94: . A number of JIT optimizations have been added, which give faster JIT
95: execution speed. In addition, a new direct interface to JIT execution is
96: available. This bypasses some of the sanity checks of pcre_exec() to give a
97: noticeable speed-up.
98:
99: . A number of issues in pcregrep have been fixed, making it more compatible
100: with GNU grep. In particular, --exclude and --include (and variants) apply
101: to all files now, not just those obtained from scanning a directory
102: recursively. In Windows environments, the default action for directories is
103: now "skip" instead of "read" (which provokes an error).
104:
105: . If the --only-matching (-o) option in pcregrep is specified multiple
106: times, each one causes appropriate output. For example, -o1 -o2 outputs the
107: substrings matched by the 1st and 2nd capturing parentheses. A separating
108: string can be specified by --om-separator (default empty).
109:
110: . When PCRE is built via Autotools using a version of gcc that has the
111: "visibility" feature, it is used to hide internal library functions that are
112: not part of the public API.
113:
114:
115: Release 8.31 06-July-2012
116: -------------------------
117:
118: This is mainly a bug-fixing release, with a small number of developments:
119:
120: . The JIT compiler now supports partial matching and the (*MARK) and
121: (*COMMIT) verbs.
122:
123: . PCRE_INFO_MAXLOOKBEHIND can be used to find the longest lookbehind in a
124: pattern.
125:
126: . There should be a performance improvement when using the heap instead of the
127: stack for recursion.
128:
129: . pcregrep can now be linked with libedit as an alternative to libreadline.
130:
131: . pcregrep now has a --file-list option where the list of files to scan is
132: given as a file.
133:
134: . pcregrep now recognizes binary files and there are related options.
135:
136: . The Unicode tables have been updated to 6.1.0.
137:
138: As always, the full list of changes is in the ChangeLog file.
139:
140:
141: Release 8.30 04-February-2012
142: -----------------------------
143:
144: Release 8.30 introduces a major new feature: support for 16-bit character
145: strings, compiled as a separate library. There are a few changes to the
146: 8-bit library, in addition to some bug fixes.
147:
148: . The pcre_info() function, which has been obsolete for over 10 years, has
149: been removed.
150:
151: . When a compiled pattern was saved to a file and later reloaded on a host
152: with different endianness, PCRE used automatically to swap the bytes in some
153: of the data fields. With the advent of the 16-bit library, where more of this
154: swapping is needed, it is no longer done automatically. Instead, the bad
155: endianness is detected and a specific error is given. The user can then call
156: a new function called pcre_pattern_to_host_byte_order() (or an equivalent
157: 16-bit function) to do the swap.
158:
159: . In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
160: code points and are now faulted. (They are the so-called "surrogates"
161: that are reserved for coding high values in UTF-16.)
162:
163:
164: Release 8.21 12-Dec-2011
165: ------------------------
166:
167: This is almost entirely a bug-fix release. The only new feature is the ability
168: to obtain the size of the memory used by the JIT compiler.
169:
170:
171: Release 8.20 21-Oct-2011
172: ------------------------
173:
174: The main change in this release is the inclusion of Zoltan Herczeg's
175: just-in-time compiler support, which can be accessed by building PCRE with
176: --enable-jit. Large performance benefits can be had in many situations. 8.20
177: also fixes an unfortunate bug that was introduced in 8.13 as well as tidying up
178: a number of infelicities and differences from Perl.
179:
180:
181: Release 8.13 16-Aug-2011
182: ------------------------
183:
184: This is mainly a bug-fix release. There has been a lot of internal refactoring.
185: The Unicode tables have been updated. The only new feature in the library is
186: the passing of *MARK information to callouts. Some additions have been made to
187: pcretest to make testing easier and more comprehensive. There is a new option
188: for pcregrep to adjust its internal buffer size.
189:
190:
191: Release 8.12 15-Jan-2011
192: ------------------------
193:
194: This release fixes some bugs in pcregrep, one of which caused the tests to fail
195: on 64-bit big-endian systems. There are no changes to the code of the library.
196:
197:
198: Release 8.11 10-Dec-2010
199: ------------------------
200:
201: A number of bugs in the library and in pcregrep have been fixed. As always, see
202: ChangeLog for details. The following are the non-bug-fix changes:
203:
204: . Added --match-limit and --recursion-limit to pcregrep.
205:
206: . Added an optional parentheses number to the -o and --only-matching options
207: of pcregrep.
208:
209: . Changed the way PCRE_PARTIAL_HARD affects the matching of $, \z, \Z, \b, and
210: \B.
211:
212: . Added PCRE_ERROR_SHORTUTF8 to make it possible to distinguish between a
213: bad UTF-8 sequence and one that is incomplete when using PCRE_PARTIAL_HARD.
214:
215: . Recognize (*NO_START_OPT) at the start of a pattern to set the PCRE_NO_
216: START_OPTIMIZE option, which is now allowed at compile time
217:
218:
219: Release 8.10 25-Jun-2010
220: ------------------------
221:
222: There are two major additions: support for (*MARK) and friends, and the option
223: PCRE_UCP, which changes the behaviour of \b, \d, \s, and \w (and their
224: opposites) so that they make use of Unicode properties. There are also a number
225: of lesser new features, and several bugs have been fixed. A new option,
226: --line-buffered, has been added to pcregrep, for use when it is connected to
227: pipes.
228:
229:
230: Release 8.02 19-Mar-2010
231: ------------------------
232:
233: Another bug-fix release.
234:
235:
236: Release 8.01 19-Jan-2010
237: ------------------------
238:
239: This is a bug-fix release. Several bugs in the code itself and some bugs and
240: infelicities in the build system have been fixed.
241:
242:
243: Release 8.00 19-Oct-09
244: ----------------------
245:
246: Bugs have been fixed in the library and in pcregrep. There are also some
247: enhancements. Restrictions on patterns used for partial matching have been
248: removed, extra information is given for partial matches, the partial matching
249: process has been improved, and an option to make a partial match override a
250: full match is available. The "study" process has been enhanced by finding a
251: lower bound matching length. Groups with duplicate numbers may now have
252: duplicated names without the use of PCRE_DUPNAMES. However, they may not have
253: different names. The documentation has been revised to reflect these changes.
254: The version number has been expanded to 3 digits as it is clear that the rate
255: of change is not slowing down.
256:
257:
258: Release 7.9 11-Apr-09
259: ---------------------
260:
261: Mostly bugfixes and tidies with just a couple of minor functional additions.
262:
263:
264: Release 7.8 05-Sep-08
265: ---------------------
266:
267: More bug fixes, plus a performance improvement in Unicode character property
268: lookup.
269:
270:
271: Release 7.7 07-May-08
272: ---------------------
273:
274: This is once again mainly a bug-fix release, but there are a couple of new
275: features.
276:
277:
278: Release 7.6 28-Jan-08
279: ---------------------
280:
281: The main reason for having this release so soon after 7.5 is because it fixes a
282: potential buffer overflow problem in pcre_compile() when run in UTF-8 mode. In
283: addition, the CMake configuration files have been brought up to date.
284:
285:
286: Release 7.5 10-Jan-08
287: ---------------------
288:
289: This is mainly a bug-fix release. However the ability to link pcregrep with
290: libz or libbz2 and the ability to link pcretest with libreadline have been
291: added. Also the --line-offsets and --file-offsets options were added to
292: pcregrep.
293:
294:
295: Release 7.4 21-Sep-07
296: ---------------------
297:
298: The only change of specification is the addition of options to control whether
299: \R matches any Unicode line ending (the default) or just CR, LF, and CRLF.
300: Otherwise, the changes are bug fixes and a refactoring to reduce the number of
301: relocations needed in a shared library. There have also been some documentation
302: updates, in particular, some more information about using CMake to build PCRE
303: has been added to the NON-UNIX-USE file.
304:
305:
306: Release 7.3 28-Aug-07
307: ---------------------
308:
309: Most changes are bug fixes. Some that are not:
310:
311: 1. There is some support for Perl 5.10's experimental "backtracking control
312: verbs" such as (*PRUNE).
313:
314: 2. UTF-8 checking is now as per RFC 3629 instead of RFC 2279; this is more
315: restrictive in the strings it accepts.
316:
317: 3. Checking for potential integer overflow has been made more dynamic, and as a
318: consequence there is no longer a hard limit on the size of a subpattern that
319: has a limited repeat count.
320:
321: 4. When CRLF is a valid line-ending sequence, pcre_exec() and pcre_dfa_exec()
322: no longer advance by two characters instead of one when an unanchored match
323: fails at CRLF if there are explicit CR or LF matches within the pattern.
324: This gets rid of some anomalous effects that previously occurred.
325:
326: 5. Some PCRE-specific settings for varying the newline options at the start of
327: a pattern have been added.
328:
329:
330: Release 7.2 19-Jun-07
331: ---------------------
332:
333: WARNING: saved patterns that were compiled by earlier versions of PCRE must be
334: recompiled for use with 7.2 (necessitated by the addition of \K, \h, \H, \v,
335: and \V).
336:
337: Correction to the notes for 7.1: the note about shared libraries for Windows is
338: wrong. Previously, three libraries were built, but each could function
339: independently. For example, the pcreposix library also included all the
340: functions from the basic pcre library. The change is that the three libraries
341: are no longer independent. They are like the Unix libraries. To use the
342: pcreposix functions, for example, you need to link with both the pcreposix and
343: the basic pcre library.
344:
345: Some more features from Perl 5.10 have been added:
346:
347: (?-n) and (?+n) relative references for recursion and subroutines.
348:
349: (?(-n) and (?(+n) relative references as conditions.
350:
351: \k{name} and \g{name} are synonyms for \k<name>.
352:
353: \K to reset the start of the matched string; for example, (foo)\Kbar
354: matches bar preceded by foo, but only sets bar as the matched string.
355:
356: (?| introduces a group where the capturing parentheses in each alternative
357: start from the same number; for example, (?|(abc)|(xyz)) sets capturing
358: parentheses number 1 in both cases.
359:
360: \h, \H, \v, \V match horizontal and vertical whitespace, respectively.
361:
362:
363: Release 7.1 24-Apr-07
364: ---------------------
365:
366: There is only one new feature in this release: a linebreak setting of
367: PCRE_NEWLINE_ANYCRLF. It is a cut-down version of PCRE_NEWLINE_ANY, which
368: recognizes only CRLF, CR, and LF as linebreaks.
369:
370: A few bugs are fixed (see ChangeLog for details), but the major change is a
371: complete re-implementation of the build system. This now has full Autotools
372: support and so is now "standard" in some sense. It should help with compiling
373: PCRE in a wide variety of environments.
374:
375: NOTE: when building shared libraries for Windows, three dlls are now built,
376: called libpcre, libpcreposix, and libpcrecpp. Previously, everything was
377: included in a single dll.
378:
379: Another important change is that the dftables auxiliary program is no longer
380: compiled and run at "make" time by default. Instead, a default set of character
381: tables (assuming ASCII coding) is used. If you want to use dftables to generate
382: the character tables as previously, add --enable-rebuild-chartables to the
383: "configure" command. You must do this if you are compiling PCRE to run on a
384: system that uses EBCDIC code.
385:
386: There is a discussion about character tables in the README file. The default is
387: not to use dftables so that that there is no problem when cross-compiling.
388:
389:
390: Release 7.0 19-Dec-06
391: ---------------------
392:
393: This release has a new major number because there have been some internal
394: upheavals to facilitate the addition of new optimizations and other facilities,
395: and to make subsequent maintenance and extension easier. Compilation is likely
396: to be a bit slower, but there should be no major effect on runtime performance.
397: Previously compiled patterns are NOT upwards compatible with this release. If
398: you have saved compiled patterns from a previous release, you will have to
399: re-compile them. Important changes that are visible to users are:
400:
401: 1. The Unicode property tables have been updated to Unicode 5.0.0, which adds
402: some more scripts.
403:
404: 2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline
405: sequence as a newline.
406:
407: 3. The \R escape matches a single Unicode newline sequence as a single unit.
408:
409: 4. New features that will appear in Perl 5.10 are now in PCRE. These include
410: alternative Perl syntax for named parentheses, and Perl syntax for
411: recursion.
412:
413: 5. The C++ wrapper interface has been extended by the addition of a
414: QuoteMeta function and the ability to allow copy construction and
415: assignment.
416:
417: For a complete list of changes, see the ChangeLog file.
418:
419:
420: Release 6.7 04-Jul-06
421: ---------------------
422:
423: The main additions to this release are the ability to use the same name for
424: multiple sets of parentheses, and support for CRLF line endings in both the
425: library and pcregrep (and in pcretest for testing).
426:
427: Thanks to Ian Taylor, the stack usage for many kinds of pattern has been
428: significantly reduced for certain subject strings.
429:
430:
431: Release 6.5 01-Feb-06
432: ---------------------
433:
434: Important changes in this release:
435:
436: 1. A number of new features have been added to pcregrep.
437:
438: 2. The Unicode property tables have been updated to Unicode 4.1.0, and the
439: supported properties have been extended with script names such as "Arabic",
440: and the derived properties "Any" and "L&". This has necessitated a change to
441: the interal format of compiled patterns. Any saved compiled patterns that
442: use \p or \P must be recompiled.
443:
444: 3. The specification of recursion in patterns has been changed so that all
445: recursive subpatterns are automatically treated as atomic groups. Thus, for
446: example, (?R) is treated as if it were (?>(?R)). This is necessary because
447: otherwise there are situations where recursion does not work.
448:
449: See the ChangeLog for a complete list of changes, which include a number of bug
450: fixes and tidies.
451:
452:
453: Release 6.0 07-Jun-05
454: ---------------------
455:
456: The release number has been increased to 6.0 because of the addition of several
457: major new pieces of functionality.
458:
459: A new function, pcre_dfa_exec(), which implements pattern matching using a DFA
460: algorithm, has been added. This has a number of advantages for certain cases,
461: though it does run more slowly, and lacks the ability to capture substrings. On
462: the other hand, it does find all matches, not just the first, and it works
463: better for partial matching. The pcrematching man page discusses the
464: differences.
465:
466: The pcretest program has been enhanced so that it can make use of the new
467: pcre_dfa_exec() matching function and the extra features it provides.
468:
469: The distribution now includes a C++ wrapper library. This is built
470: automatically if a C++ compiler is found. The pcrecpp man page discusses this
471: interface.
472:
473: The code itself has been re-organized into many more files, one for each
474: function, so it no longer requires everything to be linked in when static
475: linkage is used. As a consequence, some internal functions have had to have
476: their names exposed. These functions all have names starting with _pcre_. They
477: are undocumented, and are not intended for use by outside callers.
478:
479: The pcregrep program has been enhanced with new functionality such as
480: multiline-matching and options for output more matching context. See the
481: ChangeLog for a complete list of changes to the library and the utility
482: programs.
483:
484:
485: Release 5.0 13-Sep-04
486: ---------------------
487:
488: The licence under which PCRE is released has been changed to the more
489: conventional "BSD" licence.
490:
491: In the code, some bugs have been fixed, and there are also some major changes
492: in this release (which is why I've increased the number to 5.0). Some changes
493: are internal rearrangements, and some provide a number of new facilities. The
494: new features are:
495:
496: 1. There's an "automatic callout" feature that inserts callouts before every
497: item in the regex, and there's a new callout field that gives the position
498: in the pattern - useful for debugging and tracing.
499:
500: 2. The extra_data structure can now be used to pass in a set of character
501: tables at exec time. This is useful if compiled regex are saved and re-used
502: at a later time when the tables may not be at the same address. If the
503: default internal tables are used, the pointer saved with the compiled
504: pattern is now set to NULL, which means that you don't need to do anything
505: special unless you are using custom tables.
506:
507: 3. It is possible, with some restrictions on the content of the regex, to
508: request "partial" matching. A special return code is given if all of the
509: subject string matched part of the regex. This could be useful for testing
510: an input field as it is being typed.
511:
512: 4. There is now some optional support for Unicode character properties, which
513: means that the patterns items such as \p{Lu} and \X can now be used. Only
514: the general category properties are supported. If PCRE is compiled with this
515: support, an additional 90K data structure is include, which increases the
516: size of the library dramatically.
517:
518: 5. There is support for saving compiled patterns and re-using them later.
519:
520: 6. There is support for running regular expressions that were compiled on a
521: different host with the opposite endianness.
522:
523: 7. The pcretest program has been extended to accommodate the new features.
524:
525: The main internal rearrangement is that sequences of literal characters are no
526: longer handled as strings. Instead, each character is handled on its own. This
527: makes some UTF-8 handling easier, and makes the support of partial matching
528: possible. Compiled patterns containing long literal strings will be larger as a
529: result of this change; I hope that performance will not be much affected.
530:
531:
532: Release 4.5 01-Dec-03
533: ---------------------
534:
535: Again mainly a bug-fix and tidying release, with only a couple of new features:
536:
537: 1. It's possible now to compile PCRE so that it does not use recursive
538: function calls when matching. Instead it gets memory from the heap. This slows
539: things down, but may be necessary on systems with limited stacks.
540:
541: 2. UTF-8 string checking has been tightened to reject overlong sequences and to
542: check that a starting offset points to the start of a character. Failure of the
543: latter returns a new error code: PCRE_ERROR_BADUTF8_OFFSET.
544:
545: 3. PCRE can now be compiled for systems that use EBCDIC code.
546:
547:
548: Release 4.4 21-Aug-03
549: ---------------------
550:
551: This is mainly a bug-fix and tidying release. The only new feature is that PCRE
552: checks UTF-8 strings for validity by default. There is an option to suppress
553: this, just in case anybody wants that teeny extra bit of performance.
554:
555:
556: Releases 4.1 - 4.3
557: ------------------
558:
559: Sorry, I forgot about updating the NEWS file for these releases. Please take a
560: look at ChangeLog.
561:
562:
563: Release 4.0 17-Feb-03
564: ---------------------
565:
566: There have been a lot of changes for the 4.0 release, adding additional
567: functionality and mending bugs. Below is a list of the highlights of the new
568: functionality. For full details of these features, please consult the
569: documentation. For a complete list of changes, see the ChangeLog file.
570:
571: 1. Support for Perl's \Q...\E escapes.
572:
573: 2. "Possessive quantifiers" ?+, *+, ++, and {,}+ which come from Sun's Java
574: package. They provide some syntactic sugar for simple cases of "atomic
575: grouping".
576:
577: 3. Support for the \G assertion. It is true when the current matching position
578: is at the start point of the match.
579:
580: 4. A new feature that provides some of the functionality that Perl provides
581: with (?{...}). The facility is termed a "callout". The way it is done in PCRE
582: is for the caller to provide an optional function, by setting pcre_callout to
583: its entry point. To get the function called, the regex must include (?C) at
584: appropriate points.
585:
586: 5. Support for recursive calls to individual subpatterns. This makes it really
587: easy to get totally confused.
588:
589: 6. Support for named subpatterns. The Python syntax (?P<name>...) is used to
590: name a group.
591:
592: 7. Several extensions to UTF-8 support; it is now fairly complete. There is an
593: option for pcregrep to make it operate in UTF-8 mode.
594:
595: 8. The single man page has been split into a number of separate man pages.
596: These also give rise to individual HTML pages which are put in a separate
597: directory. There is an index.html page that lists them all. Some hyperlinking
598: between the pages has been installed.
599:
600:
601: Release 3.5 15-Aug-01
602: ---------------------
603:
604: 1. The configuring system has been upgraded to use later versions of autoconf
605: and libtool. By default it builds both a shared and a static library if the OS
606: supports it. You can use --disable-shared or --disable-static on the configure
607: command if you want only one of them.
608:
609: 2. The pcretest utility is now installed along with pcregrep because it is
610: useful for users (to test regexs) and by doing this, it automatically gets
611: relinked by libtool. The documentation has been turned into a man page, so
612: there are now .1, .txt, and .html versions in /doc.
613:
614: 3. Upgrades to pcregrep:
615: (i) Added long-form option names like gnu grep.
616: (ii) Added --help to list all options with an explanatory phrase.
617: (iii) Added -r, --recursive to recurse into sub-directories.
618: (iv) Added -f, --file to read patterns from a file.
619:
620: 4. Added --enable-newline-is-cr and --enable-newline-is-lf to the configure
621: script, to force use of CR or LF instead of \n in the source. On non-Unix
622: systems, the value can be set in config.h.
623:
624: 5. The limit of 200 on non-capturing parentheses is a _nesting_ limit, not an
625: absolute limit. Changed the text of the error message to make this clear, and
626: likewise updated the man page.
627:
628: 6. The limit of 99 on the number of capturing subpatterns has been removed.
629: The new limit is 65535, which I hope will not be a "real" limit.
630:
631:
632: Release 3.3 01-Aug-00
633: ---------------------
634:
635: There is some support for UTF-8 character strings. This is incomplete and
636: experimental. The documentation describes what is and what is not implemented.
637: Otherwise, this is just a bug-fixing release.
638:
639:
640: Release 3.0 01-Feb-00
641: ---------------------
642:
643: 1. A "configure" script is now used to configure PCRE for Unix systems. It
644: builds a Makefile, a config.h file, and the pcre-config script.
645:
646: 2. PCRE is built as a shared library by default.
647:
648: 3. There is support for POSIX classes such as [:alpha:].
649:
650: 5. There is an experimental recursion feature.
651:
652: ----------------------------------------------------------------------------
653: IMPORTANT FOR THOSE UPGRADING FROM VERSIONS BEFORE 2.00
654:
655: Please note that there has been a change in the API such that a larger
656: ovector is required at matching time, to provide some additional workspace.
657: The new man page has details. This change was necessary in order to support
658: some of the new functionality in Perl 5.005.
659:
660: IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.00
661:
662: Another (I hope this is the last!) change has been made to the API for the
663: pcre_compile() function. An additional argument has been added to make it
664: possible to pass over a pointer to character tables built in the current
665: locale by pcre_maketables(). To use the default tables, this new argument
666: should be passed as NULL.
667:
668: IMPORTANT FOR THOSE UPGRADING FROM VERSION 2.05
669:
670: Yet another (and again I hope this really is the last) change has been made
671: to the API for the pcre_exec() function. An additional argument has been
672: added to make it possible to start the match other than at the start of the
673: subject string. This is important if there are lookbehinds. The new man
674: page has the details, but you just want to convert existing programs, all
675: you need to do is to stick in a new fifth argument to pcre_exec(), with a
676: value of zero. For example, change
677:
678: pcre_exec(pattern, extra, subject, length, options, ovec, ovecsize)
679: to
680: pcre_exec(pattern, extra, subject, length, 0, options, ovec, ovecsize)
681:
682: ****
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